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From: Sender Name <[email protected]>
Date: Tue, 19 Jul 2016 09:06:21 -0600
Message-ID: <CAN_P_JNa25--hzm5=-ES9cnxgWa+h+E49OOAS7sPpV0gsoXCOw@mail.gmail.com>
Subject: Hello
To: [email protected]
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<div dir=3D"ltr">This is a test email with 1 attachment.<br clear=3D"all"><=
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--001a11447dc881e40f0537fe6d5a--

PartsFilterIterator.php

<?php

declare(strict_types=1);

namespace App\Iterator;

use Laminas\Mime\Part;

class PartsFilterIterator extends \RecursiveFilterIterator
{
    public function accept(): bool
    {
        /** @var Part $part */
        $part = parent::current();

        return $this->hasChildren() ||
            (str_starts_with($part->getType(), "text/plain")
            || str_starts_with($part->getType(), "text/html"))
        ;
    }

    public function hasChildren(): bool
    {
        return $this->getInnerIterator()->hasChildren();
    }

    public function getChildren(): PartsFilterIterator
    {
        return new self($this->getInnerIterator()->getChildren());
    }
}

PartsFilterIteratorTest.php

<?php

declare(strict_types=1);

namespace AppTest\Iterator;

use App\Iterator\PartsFilterIterator;
use App\Iterator\PartsIterator;
use Laminas\Mail\Message;
use Laminas\Mime\Part;
use PHPUnit\Framework\TestCase;
use RecursiveArrayIterator;

class PartsFilterIteratorTest extends TestCase
{
    public function testIteratesSuccessfullyOverPartsData()
    {
        $email = file_get_contents(
            __DIR__ . '/../../_files/mail_with_pdf_attachment.eml'
        );
        $message = Message::fromString($email);

        /** @var Part[] $iterator */
        $iterator = new \RecursiveIteratorIterator(
            new PartsFilterIterator(
                new PartsIterator(
                    $message->getBody()->getParts()
                ),
            ),
            \RecursiveIteratorIterator::SELF_FIRST
        );

        foreach ($iterator as $key => $value) {
            echo $value->getType();
        }

        $this->assertCount(2, $iterator);
    }
}

PartsIterator.php

<?php

declare(strict_types=1);

namespace App\Iterator;

use Laminas\Mime\Part;

class PartsIterator extends \RecursiveArrayIterator
{
    public function hasChildren(): bool
    {
        /** @var Part $part */
        $part = $this->current();
        return ! empty($part->getParts());
    }

    public function getChildren(): \RecursiveArrayIterator
    {
        /** @var Part $current */
        $current = $this->current();
        return new PartsIterator($current->getParts());
    }
}